Wrong contact shown on incoming call

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I have an issue with the wrong contact showing for certain incoming calls. The problem arises becasue I have a second, similar contact entry for a couple people.
Basically, I have one contact entry for Joe Blow at 123-456-7890.
Additionally, I have a separate contact entry of "Forward voicemail to Joe Blow", to forward an external mailbox to his phone number (something we have to do for work). This involves a long string of typing - the voicemail number, a couple pauses, a code and finally his phone number - so it ends up something like "805-555-1212,,999,,123-456-7890".
(General)